CN108369364A - Adaptive light source - Google Patents

Abstract

A kind of method according to an embodiment of the invention, including：Create the three-D profile of scene；The opposite light quantity of each part of scene is calculated based on the three-D profile；And activating light source with to the first part of scene provide the first amount light, and to the second part of scene offer the second amount light.First amount and the second amount are different.First amount and the second amount are the opposite light quantities of each part by calculating scene to determine.

Description

Adaptive light source

Background technology

Including light emitting diode（LED）, resonator light emitting diode（RCLED）, vertical cavity laser diodes（VCSEL）With The light emitting semiconductor device of edge emitter laser is currently available one of most effective light source.It is interested at present to be used to make The material system for making the high brightness luminescent device that can be operated across limit of visible spectrum includes Group III-V semiconductor, especially gallium, Aluminium, the binary of indium and nitrogen, ternary and quaternary alloy, also referred to as III-nitride material.Typically, pass through Organometallic Learn vapor deposition（MOCVD）, molecular beam epitaxy（MBE）Or other epitaxy technologies sapphire, silicon carbide, group III-nitride or Epitaxial growth prepares III group nitrogen with different form with the stacking of the semiconductor layer of concentration of dopant in other suitable substrates Compound luminescent device.It stacks and generally includes to be formed in n-layer doped with such as Si of one or more on substrate, is formed in In active area on one or more n-layers one or more luminescent layers and be formed on active area doped with example Such as one or more p-type layers of Mg.Electrical contact is formed in n-type area and p-type area.

Due to its compact dimensioning and low-power consumption requirement, light emitting semiconductor device is setting of being battery powered of such as hand-held It is standby（Such as camera and mobile phone）Camera flashlamp light source attractive candidate.

Invention content

According to an embodiment of the invention, a kind of light source is provided, which can be used for example as the flash lamp or use of camera In any other suitable purposes.Light source, which is configured so that, can change lighting pattern launched by light source.For example, when being used as When camera flashlamp, for the given scenario in camera coverage, light source can not well not illuminated by ambient light into scene Part more light is provided, and less light is provided by the part that ambient light well illuminates into scene.

Description of the drawings

Fig. 1 is that diagram includes block diagram of at least one light emitting semiconductor device as the system of light source.

Fig. 2A, Fig. 2 B and Fig. 2 C illustrate the method that scene is illuminated using the system of such as Fig. 1.

Fig. 3 illustrates the scene to be illuminated.

Fig. 4 illustrates the three-dimensional of scene shown in Fig. 3（3D）Map.

Fig. 5 illustrates the flash intensity profile of scene shown in Fig. 3.

Fig. 6 is the sectional view of an example of light source.

Fig. 7 is the vertical view of LED array.

Fig. 8 is the sectional view of a LED in the array of Fig. 7.

Fig. 9 illustrates the scene illuminated in the example in following figure.

Figure 10 A, Figure 11 A, Figure 12 A, Figure 13 A, Figure 14 A and Figure 15 A illustrate the different illumination wheel of scene shown in Fig. 9 It is wide.

Figure 10 B, Figure 11 B, Figure 12 B, Figure 13 B, Figure 14 B and Figure 15 B illustrate the LED being applied in the array of Fig. 7 with life At the magnitude of current of illumination profile shown in Figure 10 A, Figure 11 A, Figure 12 A, Figure 13 A, Figure 14 A and Figure 15 A.

Figure 16 and Figure 17 illustrates the LED being applied in the array of Fig. 7 to generate the illumination profile for application of focusing The magnitude of current.

Figure 18 illustrates the LED being applied in the array of Fig. 7 to generate the magnitude of current for the illumination profile applied for wide-angle.

Figure 19 is the sectional view of the LED array with independent optical device.

Figure 20 illustrates the light source with multiple LED array.

Figure 21 illustrates scanning arrow beam of light light source.

Figure 22 illustrates the light source with matrix majorization element.

Figure 23 illustrates the light source of the photophore of the light with transmitting different colours or colour temperature.

Specific implementation mode

Although in the following description, the embodiment of the present invention is described as camera flashlamp, other purposes Be considered and within the scope of the invention.

The object that one problem of all camera flashlamps is proximate to camera is usually over-exposed, and far from camera Object do not obtain enough light.The embodiment of the present invention include for example for portable or battery powered equipment or The light source of such as camera flashlamp for the larger battery-powered photo studio flash lamp of non-electrical.It is according to the ... of the embodiment of the present invention Light source can make their illumination profile be adapted to scene and the suitable light of all objects transmission into scene.According to this hair The adaptive light source of bright embodiment may include the semiconductor light source of such as light emitting semiconductor device, although can use any Suitable light.

Fig. 1 illustrates the examples of adaptive light source according to the ... of the embodiment of the present invention.System shown in Fig. 1 can by including In smart mobile phone or any suitable equipment.System shown in Fig. 1 includes being connected to the light source 10 of driver 12.Following institute It states, driver 12 is powered to light source 10.Driver 12 is connected to microprocessor 14.Microprocessor, which receives, comes from 18 He of input equipment The input of camera 11.System can also include 3D sensors 16.Input equipment 18 can be that such as user activated input is set It is standby, such as user presses to shoot the button of photo.In some embodiments, input equipment 18 may not be needed user's input, Such as in the case where automatically snapping photo.In some embodiments, input equipment 18 can be omitted.

3D sensors 16 can be any suitable sensor for the 3D profiles that scene can be made before shooting photo. In some embodiments, 3D sensors 16 can be the flight time（ToF）Camera.The measurement of ToF cameras is reflected from object Optical transport returns to the time needed for ToF cameras.The time can be used for calculating the distance of each object in scene.In some realities It applies in example, 3D sensors 16 can be structured light sensor.Structured light sensor includes projection device, which exists Specially designed light pattern is projected in scene.The camera being also included in structured light sensor measures the object from scene The position of each part of the light pattern of reflection, and the distance to these objects is determined by triangulation.In some embodiments In, 3D sensors 16 can be the one or more assisted photographics positioned with being spaced from each other a distance in the main body of equipment Machine.By comparing the position for the object that such as assisted photographic machine is seen, the distance to each object can be determined by triangulation. In some embodiments, 3D sensors 16 are the automatic focusing signals of the main camera in equipment.In smear camera camera lens When focusing position, system can detect which of scene is partly in focusing state in which position.Then by that will correspond to Lens location be converted into the distance for the object focused for these positions to build the 3D profiles of scene.By conventional method （Such as by measuring contrast or by using the phase detection sensor in camera sensor）Export is suitable automatic poly- Burnt signal.It is in some embodiments, as follows for the best-of-breed functionality of adaptive flash lamp when using phase detection sensor Described, the position of each phase detection sensor can correspond to the region illuminated by the segregation section of light source 10.

An example of the method using system shown in Fig. 1 is illustrated in Fig. 2A.In frame 20, input, example are generated Such as indicate shooting photo.In block 22, the first preliminary images of the photographed scene in the case where flash lamp is closed of camera 11（It is right It should be in the visual field of camera）.In frame 24, light source 10 is in low patterned optical output（Commonly referred to as " torch mode "）Lower unlatching. At this point, the illumination profile of light source 10 keeps uniform, wherein " uniform " means that all parts of scene are all taken turns with known illumination Exterior feature illuminates.In frame 26, the second preliminary images are captured when light source 10 is persistently opened with uniform illumination profile and low-light level. In frame 27, system is that all parts of scene calculate optimal brightness to realize optimum exposure.This can be by from the second image The pixel brightness value of the first preliminary images is subtracted in each pixel brightness value and scales difference to realize that optimum exposure level is come It completes.In frame 28, camera 11 shoots final photo, wherein according to the illumination profile activating light source 10 calculated in frame 27.

Another example of the method using system shown in FIG. 1 is illustrated in fig. 2b.In block 200, input is generated, Such as instruction shooting photo.In frame 220, the first preliminary images of the photographed scene in the case where flash lamp is closed of camera 11 （Corresponding to the visual field of camera）.In frame 230, the 3D profiles of scene are generated.For example, 3D sensors 16 can generate scene 3D profiles or 3D sensors 16 can sense the data about scene and transfer data to microprocessor 14, microprocessor Device 14 can generate the 3D profiles of scene.In frame 270, the optimal brightness of all parts of system-computed scene is best to realize Exposure.In frame 280, based on the calculating executed in frame 270, scene is illuminated by light source.

Another example of the method using system shown in FIG. 1 is illustrated in Fig. 2 C.In frame 2000, input is generated, Such as instruction shooting photo.In frame 2200, the first preliminary figure of the photographed scene in the case where flash lamp is closed of camera 11 Picture（Corresponding to the visual field of camera）.In frame 2300, the 3D profiles of scene are generated.In frame 2400, light source 10 is defeated in low light Go out pattern（Commonly referred to as " torch mode "）Lower unlatching.At this point, the illumination profile of light source 10 keeps uniform, wherein " uniform " meaning All parts that taste scene are all illuminated.In frame 2600, light source 10 captures the second preliminary images under torch mode. In frame 2700, input of the system based on 2 captured images and as described in the text of adjoint Fig. 2A and Fig. 2 B above 3D profiles come calculate scene all parts optimal brightness to realize optimum exposure.In frame 2800, camera 11 is shot most Whole photo, wherein light source 10 are activated according to the illumination profile calculated in frame 2700.

In each of Fig. 2A, 2B and 2C, input can be that such as such as user is inputted, by the user of lower button by micro- The input that processor 14 generates（For example, if microprocessor 14 be programmed to the predetermined time shoot photo or with it is scheduled when Between interval shooting photo）Or any other suitable input.Fig. 3 illustrates the field that captured in photo when generation is inputted Scape.Scene shown in Fig. 3 includes the second people 32 in the first 30 and background in foreground.Selection should only for illustration purpose Scene.Other scenes with multiple objects or people away from the various distances of camera are also applied for the present invention.

Fig. 4 illustrates the 3D profiles of scene shown in Fig. 3.In Fig. 4, shallower shade corresponds to shorter away from camera Distance, dark shade correspond to away from the larger distance of camera.Therefore, the people 30 in foreground has most shallow shade, shows People 30 is nearest from camera.People 32 in background has dark shade, shows people 32 away from camera farther out.Background is black, It indicates farthest away from camera.

Higher luminous intensity may be received by being located remotely from the object of flash lamp；The object for being located close to flash lamp may Receive less light.It is well known that illuminance reduces according to the inverse square law of distance（1/ distance of illumination²）.It utilizes The 3D profiles of scene, therefore the institute's light requirement for which part for being assigned to scene can be calculated.Intensity profile needed for calculating Algorithm is also conceivable to the information collected when illumination, capture first image of each object in scene from environment light-receiving, and And it can correspondingly adjust the amount of flash light.For example, the object 30 well illuminated（Such as because they are light or anti- It penetrates）Less light can be received；The object not illuminated well（Such as because they are black or unreflecting）It can connect Them can be based only upon at a distance from light source to calculate by receiving ratio（As determined by 3D profiles）More light.

Digital camera and its image processor generally include face recognition algorithms.In some embodiments, face is come from The information of recognizer can be used for（Compared with other objects）Preferably illuminate face.If not enough light comes well Whole photo is exposed, then face can benefit from more light.If people is too close and has the danger of overexposure, this spy should be closed Sign so that do not have more light and be directed to face.In some embodiments, the calculating of the light relatively from 3D profiles can be reduced The light quantity of human eye is sent to so that " blood-shot eye illness " in photo minimizes.

In some embodiments, the calculating of the light relatively from 3D profiles can be identified far from flash of light and cannot be fitted When the part of the scene illuminated.Minimal amount of light is sent to these parts of scene, to be sent out towards the useful part of scene The light quantity sent maximizes, and therefore provides the better utilization to available driving current capacity.

In some embodiments, user interface（For example, the touch screen on smart mobile phone）User's control can be allowed to send To the opposite light quantity of each part of scene.For example, user can open and close the self-adaptive features of flash lamp, can open With closing for according to 3D profiles（As described above）The various pieces of the algorithm of light relatively are calculated, and can be dynamic in scene left-hand seat Create flash lamp emphasis.

The embodiment of the present invention considers several light illumination modes.

In some embodiments, in first group of light illumination mode, the illumination from light source 10 is across scene distribution to realize It is most uniformly useful to be illuminated photo.Specifically, in some embodiments, overexposure is minimized：In foreground by ambient light In the case of well illuminating, all light from light source 10 are all directed to background.In some embodiments, light source serves as flash of light Lamp is filled up：In the case where background is well illuminated by ambient light, all light from light source 10 are all directed to foreground.One In a little embodiments, when foreground and background are by ambient lighting uniform illumination, after the light from light source 10 can be largely sent to Scape.In some embodiments, in the case where foreground is dark, it is good to obtain that the light from light source 10 illuminates foreground enough just Photo, and its remaining light from light source 10 is sent to background.

In some embodiments, in second group of light illumination mode, selected object is illuminated.Specifically, in some implementations In example, in conjunction with face recognition, face can superlatively be weighted to obtain optimal illumination.In some embodiments, in conjunction with face Identification, face（Or other objects）Around background can receive less light, such as to enhance the face illuminated and closest Contrast between the background of face.In some embodiments, the selection area of scene is for example identified by user's input.Come It can be only directed in selected region from the light of light source 10.The example of selected areas include amplification image or scene its His identification division.In some embodiments, for the photo of such as business card, the light from light source 10 can be with very high uniform Horizontal emission.

Fig. 5 illustrates the light that calculating based on shown in Fig. 4 is provided to the scene of Fig. 3.In Figure 5, shallower shade corresponds to In more light from light source 10, and dark shade corresponds to the less light from light source 10.As shown in figure 5, with it is rear Scape people provides more light in 32 corresponding region 42, and provides less light in region corresponding with foreground people 30 40.Volume Outer light is provided to the face 52 of the people in background.Minimal amount of light can be supplied to both nobody 30 or nobody 32 go out Existing background（It is not shown）.

Fig. 6, Fig. 7 and Fig. 8 illustrate an example of the light source 10 that can be used in the system shown in figure 1.It can make With any suitable light source, and the embodiment of the present invention is not limited to Fig. 6, Fig. 7 and structure shown in fig. 8.

Fig. 7 is the vertical view of the quadrate array 60 of LED 62.LED 62 can integrally be grown on a single substrate.It can Alternatively, LED 62 need not integrally be grown on a single substrate, but can be cut, and be then arranged on pedestal, So that adjacent LED is very close.In some embodiments, the gap between LED 62 is less than single led 62 size（Example Such as width）1/3.Although illustrating 3 × 3 quadrate arrays, any appropriate number of LED, and array can be used Square is needed not be, it can be rectangle or any suitable shape.Single led size can depend on several designs and join Number, for example, the construction volume comprising optical lens（building volume）, camera visual field and array in LED number Amount.For example, array must illuminate total visual field of camera comprising enough LED（I.e. entire scene）.Smart mobile phone is answered With in some embodiments, the overall width of array can be not more than 2mm.For larger camera, in some embodiments, The width of array can be not more than 10mm.Although it is single led be it is square, this is not required；Rectangle can be used The LED of LED or any suitable shapes.

Fig. 6 is the viewgraph of cross-section of light source 10.The array 60 of LED 62 is positioned such that from the big portion that array 60 extracts Light splitting emits towards optical device 64.In the example shown, optical device 64 is spaced apart with array 60.Alternatively, optics Device 64 can be placed on the top of array 60.Optical device 64 can be the appropriate area for making light collimate and light being directed to scene Any suitable structure in domain.Optical device 64 can be such as lens, multiple lens, one or more Fresnel lenses, one A or multiple refractors, one or more total internal reflection lens elements, one or more reflectors, one or more collimators Or any other suitable optical device.In the following example, optical device 64 is Fresnel lens.Light source can be box-like 66, wherein array 60 is arranged in the bottom of box, and optical device 64 forms the top of box.The madial wall 68 of box, not by array Any part of 60 bottoms occupied and be all the one of optical design not by any part at the top that optical device 64 occupies Part, and therefore can be optionally reflection or light absorbing.

Fig. 8 is the sectional view of single led 62 example in Fig. 6 and array shown in Fig. 7.It can use any Suitable LED, and the embodiment of the present invention is not limited to structure shown in Fig. 8.In the device of Fig. 8, most of light passes through life Long substrate is extracted from LED.Such device can be referred to as flip chip devices.As known in the art, by III nitride semiconductor structure is grown in growth substrate 70 to form the LED of Fig. 8.Growth substrate is typically sapphire, but can To be such as non-III-nitride material, SiC, Si, GaN or any suitable substrate of composite substrate.It grows thereon The surface of the growth substrate of III nitride semiconductor structure can be patterned, is roughened or texture before growth, this The light extraction from device can be improved.The surface opposite with growing surface of growth substrate（Pass through in flip chip configuration It extracts the surface of most of light）Can before growth or later be patterned, be roughened or texture, this can improve from The light extraction of device.

Semiconductor structure includes the luminous zone being clipped between n-type area and p-type area or active area.N-type area 72 can give birth to first It is long, and may include multiple layers of different compositions and concentration of dopant, including for example can be N-shaped or unintentionally adulterate Preparation layer（Such as buffer layer or nucleating layer）And effectively shine designed for luminous zone required particular optical, material or electricity The N-shaped of property or even p-type device layer.Luminous zone or active area 74 are grown on n-type area.The reality of suitable light-emitting zone Example include single thick or thin luminescent layer or include the multiple thin or thick luminescent layer separated by barrier layer multiple quantum well light emitting Area.Then p-type area 76 can be grown on luminous zone.Similar to n-type area, p-type area may include having different compositions, thickness With multiple layers of concentration of dopant, including the layer or n-layer that unintentionally adulterate.

After semiconductor structure growth, the p-contact 78 of reflection is formed on the surface of p-type area.P-contact 78 usually wraps Include multiple conductive layers, the protection metal of such as reflective metals and the electromigration that reflective metals can be prevented or reduced.Reflective metals It is typically silver-colored, but any suitable one or more materials can be used.After forming p-contact 78, removal p-contact 78, p-type A part for area 76 and active area 74 forms a part for the n-type area 72 of n contacts 80 with exposure thereon.N contacts 80 and p-contact 78 Electrically isolated from one by gap 82, gap 82 can be filled with the oxide of such as silicon or the electricity of any other suitable material is situated between Matter.Multiple n contact through holes can be formed；N contacts 80 and p-contact 78 are not limited to arrangement shown in Fig. 8.As known in the art , n contacts and p-contact can be redistributed to form the pad stacked with dielectric/metal（It is not shown）.

As described above, the LED 62 in array 60 can be formed on a single wafer, then cut from chip as array 60 It cuts off, each LED 62 wherein in array remains attached to single growth substrate part.Alternatively, it is possible to single brilliant On piece forms many LED 62, is then cut down from chip so that each LED cut down is arranged on pedestal To form array 60.

Substrate 70 can be thinning after semiconductor structure growth or after forming each device.In some embodiments In, remove substrate from the device of Fig. 8.The most of light extracted from the device of Fig. 8 passes through substrate 70（Or by removing substrate 70 The surface of exposed semiconductor structure）Extraction.The embodiment of the present invention is not limited to flip-chip LED- can be using any suitable Device.

Wavelength transformational structure 84 can be arranged in from the path for the light that luminescent device extracts.Wavelength transformational structure includes one Kind or multi-wavelength's transition material, can be for example conventional phosphor, organic phosphor, quantum dot, organic semiconductor, II-VI or III-V semiconductors, II-VI or III-V semiconductor-quantum-points or nanocrystalline, dyestuff, polymer or other luminous materials Material.Wavelength conversion material absorbs light emitted by the LED and emits the light of one or more different wave lengths.It is emitted by the LED not turn The light changed is typically a part for the final spectrum extracted from structure, although this is not required.It is extracted most from structure Whole spectrum can be white, polychrome or monochrome.The example of Common combinations includes being combined with the wavelength conversion material of transmitting yellow light Emit blue light LED, with transmitting green light and feux rouges wavelength conversion material is combined transmitting blue light LED, and emit blue light and The LED for the transmitting UV that the wavelength conversion material of yellow light combines and the wavelength conversion material knot with transmitting blue and green light and feux rouges The LED of the transmitting UV of conjunction.The wavelength conversion material for emitting other color of light can be added to adjust the spectrum extracted from structure. Wavelength transformational structure 84 may include light-scattering component or light diffusing member, such as TiO₂。

In some embodiments, Wavelength transformational structure 84 is prepared separately with LED and for example by bonding chip or all As the proper adhesive of silicones or epoxy resin is attached to the structure of LED.One example of this prefabricated Wavelength changing element It is ceramic phosphor, is formed for example, by sintering the precursor material of powder phosphor or phosphor into ceramic wafer, then Individual Wavelength changing element can be cut to.Ceramic phosphor can also be for example, by tape casting（tape casting）It is formed, ceramics are manufactured into appropriate shape in this case, without cutting or being sliced.Suitable non-ceramic The example of pre-formed Wavelength changing element include：The powder phosphor being dispersed in the transparent material of such as silicones or glass Body, the transparent material are rolled-up, cast or are otherwise formed into sheet material, are then individually melted into individual wavelength convert member Part；The powder phosphor for being arranged in the transparent material of such as silicones and being laminated on LED wafer or individual LED；With And it is mixed with silicones and arranges phosphor on a transparent substrate.Wavelength changing element need not be pre-formed, it can be example The wavelength conversion material such as mixed with clear binder, be laminated, distribute, depositing, silk-screen printing, electrophoretic deposition or with other Mode is located in the path of light emitted by the LED.

As shown in figure 8, Wavelength transformational structure 84 need not be arranged to be in direct contact with LED；In some embodiments, wavelength turns Structure 84 is changed to be spaced apart with LED.

Wavelength transformational structure 84 can cover the whole element of multiple or whole LED in array, or can be by It is configured to the section of separation, each section is attached to corresponding LED.Gap between the section of these separation of Wavelength transformational structure 84 can To be filled with optical reflectors, the section will be only limited to from each section of light emitting.

Such as solder, stud bumps（stub bump）, layer gold or any other suitable structure interconnection（Do not show Go out）Can be used for by array 60 LED 62 be electrically connected and be physically connected to such as pedestal, folder circuit board or it is any its His suitable structure.Pedestal may be configured so that each LED 62 can individually be controlled by the driver 12 of Fig. 1.By each The different piece for the illumination bright field scape that LED 62 emits.By changing the electric current of each LED, pair for being supplied to scene can be changed Answer the light of part.The optimum illumination profile for the scene being computed as described above out can be by providing electricity appropriate to each LED 62 Flow horizontal obtains.

In some equipment of such as mobile device or the equipment being battery powered, the adaptive light source of Fig. 1 is available most High-amperage is usually by the capacity limit of device battery.When defining drive current level for all LED 62, system is usually examined Consider maximum available current budget, and be thus that each LED 62 defines drive current level so that total driving current is no more than Maximum value, while keeping the appropriate intensity between LED and total light output is made to maximize.

Fig. 9 is illustrated will shine in the example shown in following figure 10 A, Figure 11 A, Figure 12 A, Figure 13 A, Figure 14 A and Figure 15 A Bright scene.For each example, be supplied to the magnitude of current of each LED Figure 10 B, Figure 11 B, Figure 12 B, Figure 13 B, Figure 14 B and It is illustrated in Figure 15 B.According to the calculating according to above-mentioned 3D profiles, by the target 88 of the broken line representation in Fig. 9 need than scene its The more light of remaining part point.In each of Figure 10 A, Figure 11 A, Figure 12 A, Figure 13 A, Figure 14 A and Figure 15 A, it is supplied to region Light quantity is as the darkness of shade increases and reduces.Every light distribution shown in figure can be opposite.

Figure 10 A are illustrated when the identical magnitude of current as shown in Figure 10 B is supplied in all LED 62, and how scene is shone It is bright.The center of scene is illuminated brightly, and the outer edge of scene is then less is illuminated.Therefore, close to the target of scene center Part is more illuminated than the target part at close scene edge.

Figure 11 A illustrate how the scene when electric current only is supplied there are three LED is illuminated, each in three LED The identical magnitude of current is received, and other six LED do not receive electric current.As shown in Figure 11 B, be supplied electric current three LED 91, 92 and 93 be center LED and two bottom LED in left column.As shown in Figure 11 A, the right side of scene（It corresponds roughly to Target）Rest part than scene by brighter illuminates.The current density of LED 91,92 and 93 in Figure 11 B can be than figure Situation shown in 10B（Identical electric current is supplied in wherein all LED）It is three times higher.The illumination ratio of target in Figure 11 A About 1.6 times of the illumination height of target in Figure 10 A.

In order to obtain higher illumination, less section can be opened, as shown in Figure 12 A, Figure 12 B, Figure 13 A and Figure 13 B Illustrated in two examples.

Figure 12 A illustrate how the scene when electric current only is supplied there are two LED is illuminated, and each LED reception is identical The magnitude of current, and other seven LED do not receive electric current.As shown in Figure 12 B, two LED 94 and 95 that electric current is supplied are left columns In two bottom LED.As illustrated in fig. 12, the right side of scene（Correspond roughly to target）It is more brighter than the rest part of scene It illuminates on ground.The illumination of target in illumination ratio Figure 11 A of target in Figure 12 A is big.

Figure 13 A illustrate when only it is single led electric current is supplied and when other eight LED do not receive electric current scene how by It illuminates.As shown in Figure 13 B, the LED 96 that electric current is supplied is the center LED in left column.As shown in FIG. 13A, the right side of scene （Correspond roughly to target）Rest part than scene by brighter illuminates, however point ratio Figure 12 A and Figure 11 A that height illuminates In it is small.The illumination of target in Figure 13 A is more than the illumination of the target in Figure 11 A.

In order to improve the illuminance uniformity across entire target, be supplied to the electric current of different LED that can change, as Figure 14 A, Illustrated in two examples shown in Figure 14 B, Figure 15 A and Figure 15 B.

Figure 14 A illustrate when different levels of current is supplied in six LED and three LED do not receive electric current scene such as What is illuminated.The electric current that center LED 96 in left column is supplied is five LED, 97,98,99,100 and around LED 96 Five times of 101.As shown in Figure 14B, three LED in right row do not receive electric current.As shown in Figure 14 A, the right side of scene（It is substantially right It should be in target）Rest part than scene by brighter illuminates.In the illumination ratio such as Figure 13 A of target evenly.

Figure 15 A illustrate when different levels of current is supplied in four LED and five LED do not receive electric current scene such as What is illuminated.The electric current that center LED 102 in left column is supplied is than more than 105 four times of bottom LED in middle column Twice of bottom LED 103 in center LED 104 and left column.As shown in fig. 15b, the LED pushed up in capable LED and right row does not connect Receive electric current.As shown in fig. 15, the right side of scene（Correspond roughly to target）Rest part than scene by brighter illuminates. In the illumination ratio such as Figure 13 A of target evenly.

Figure 16,17B and 18B illustrate how to apply a current to the array 60 of the LED 62 in Fig. 6, for focusing and Wide-angle application.It furthers when receiving（zoom in）When the order of camera gun, the LED reception near array center is more electric Stream, as shown in Figure 16 and Figure 17 B.Figure 17 A illustrate the scene when different levels of current as seen in this fig. 17b are supplied in LED How to be illuminated.

It is zoomed out when receiving（zoom out）When the order of camera gun, the LED reception near array edges is more electric Stream, as shown in figure 18b.Figure 18 A illustrate when different levels of current as shown in figure 18b are supplied in LED scene how by It illuminates.

In figure 16, focusing being applied, electric current is supplied in only center LED 110, and around eight LED of center LED Do not receive electric current.The center of scene will be illuminated brightly, and the edge of scene will receive less light.The photograph at the center of scene Degree can be than the scene in Figure 10 A（Wherein all nine LED receive equal electric current）Center increase by 2.2 times.

In Figure 17 B, focusing is applied, the electric current that center LED 111 is supplied is twice of LED 112, and is Four times of LED 114.The center of scene is brighter than the edge of scene.The illumination at the center of scene can be than the scene in Figure 10 A （Wherein all 9 LED receive equal electric current）Center increase by 1.15 times.

In Figure 18 B, for wide-angle application, eight LED118 at array edges receive equal electric current, and center LED116 does not receive electric current.The illumination at the center of scene can be reduced to Figure 10 A Scenes（Wherein all 9 LED receive phase Deng electric current）0.85 times of center illumination.

Adaptive light source can be used for by only providing electric current to the LED corresponding to each target, or by correspondence More current is provided in the LED of each target to illuminate multiple targets.Adaptive flash lamp can be used for by only to corresponding to The LED of element far from camera provides electric current, or by providing more electricity to the LED corresponding to the element far from camera Stream includes close to camera and the overexposure of the scene of the element far from camera to reduce.

It is 3 × 3 arrays progress for the diagram with single Fresnel lens for the brightness value that examples detailed above provides It calculates.The light output of each LED in examples detailed above by the driving current of LED or can pass through the arteries and veins with fixed current The duration is rushed to control.

Figure 19, Figure 20, Figure 21, Figure 22 and Figure 23 have illustrated interchangeable light source.

In the light source of Figure 19, each LED 62 in array has individual optical device 122, rather than for entire The single optical device of array, as shown in Figure 6.Light from its LED is directed to the particular portion of scene by each optical device 122 Point.Optical device 122 can be any suitable optical device, including such as lens, domed lens, Fresnel lens, reflection Device, total internal reflection lens or any other suitable structure.Optical device 122 need not be identical；Different optical devices can be used Different LED 62 in array.

The light source of Figure 20 includes the multiple LED array for having multiple optical elements.For example, Figure 20 illustrates two 3 × 3 gusts Row, each array have single corresponding Fresnel lens.More or fewer arrays can be used, and array is not limited to institute The equipment shown.In some embodiments, each array illuminates a part for scene.Array 124 in Figure 20 illuminates the top of scene Portion 128, and array 126 illuminates the bottom 130 of scene.In some embodiments, array illuminates the lap of scene, so as to Lap provides more light.For example, array may be overlapped at the center of scene, the center of scene may be usually to be needed than edge Want the part of the scene of more light.

The light source of Figure 21 uses the luminescent device of arrow beam of light, such as laser.The light source of Figure 21 includes having wavelength The laser 140 of conversion element 142, the Wavelength changing element 142 are arranged in the path of the light from laser.Focus optics Device 144 can create the light beam of desired size.Before being incident in scene 150, light beam is incident on 146 He of the first scanning mirror Second scanning mirror 148.Scanning mirror can move so that the entire scene of light beam scanning, and the intensity of driver control light source so that The different piece of scene can receive different light quantities.When light beam scanning needs the scene parts of higher-strength, it is supplied to sharp The electric current of light device increases；When light beam scanning needs the part of more low intensive scene, the electric current of laser is supplied to reduce.

The light source of Figure 22 includes matrix majorization element, such as digital micro-mirror switching device or multistage liquid crystal display.It comes from The bright matrix majorization element of the illumination of LED or laser 152 154.The intensity of reflection or transmitted light is according to the illumination profile calculated And it is changed.Reflection or transmitted light from Inverse problem element 154 are projected in scene 156.Inverse problem element 154 can Using with many small reflectors as pixel.The orientation of each speculum can change, to adjust the intensity at each pixel.Instead The orientation for penetrating mirror can also be used for creating brighter region by making the light beam from different speculums be overlapped.

The light source of Figure 23 is Color tunable.The light source of Figure 23 includes two arrays 160 and 162, they are arranged ingredient Not Fa She light beam 166 and light beam 168, when they illuminate scene 164, light beam 166 and light beam 168 are overlapped.Although illustrate as Two arrays as array shown in fig. 6, but other suitable optical transmitting sets can be used.The system may include 3 or More arrays with different emission spectrum.Array 160 and array 162 emit the light of different colours.For example, 160 He of array Array 162 can all emit white light, although array 160 can emit the white light-with the colour temperature different from array 162 that is, battle array A transmitting warm white in row 160 and array 162.For example, the array of transmitting warm white can emit with down to 1700K's The light of colour temperature, and the array for emitting cool white light can emit the light with the up to colour temperature of 10000K.The colour temperature of two arrays On difference can be at least 1000K in some embodiments, at least 2000K in some embodiments, in some embodiments At least 3000K, and at least 4000K in some embodiments.Alternatively, array 160 and array 162 can emit different Monochromatic light.The appropriate electric current for each LED being supplied in each array is calculated so that the light from array 160 and array 162 Summation have for scene each part appropriate illumination and colour temperature.The light for emitting additional color or colour temperature can be added Array（Or other optical transmitting sets）.

In some embodiments, the LED for emitting multiple spectrum can be with single staggered and single light as shown in FIG. 6 Learn device or each optical device as shown in figure 19 combination.The LED of different colours can arrange in multiple groups, each group A part for scene is illuminated, each group includes at least one LED of each different colours.

Color tunable light source described above can be used for utilizing different correlated colour temperatures（CCT）Light illuminate scene not Same part.It is, for example, possible to use color tunable light source carrys out the CCT of balanced varying environment illuminator.Field with low CCT ambient lights Scape part can be bright with the illumination of higher CCT, and the scene parts with high CCT ambient lights can be bright with the illumination of relatively low CCT.

In some embodiments, light source 10 can be used together from different cameras.For example, smart mobile phone may have it is more A camera or different smart mobile phone models may use different cameras.Each camera can have specific Visual field adjusts the camera flashlamp thus（For example, being adjusted to provide minimal illumination level in the corner of visual field）.Therefore, right In conventional flash lamp, each camera needs are adjusted to the individual flash lamp of the visual field of the camera.Using according to this hair The adaptive light source of bright embodiment can define and select the acquiescence current distribution of each camera when selecting camera, So that single source can be used for multiple cameras.As in the embodiments above, the default setting of each camera can root It modifies according to the scene shot.

Although in the above-described example, light emitting semiconductor device is the group III-nitride LED for emitting blue light or UV light, can To use light emitting semiconductor device in addition to the led（Such as laser diode）With by other materials system（Such as other III-V material, III group phosphide, III group arsenide, II-VI group material, ZnO or Si sills）Manufactured semiconductor hair Optical device.

The present invention is described in detail, it would be recognized by those skilled in the art that in the case of the given disclosure, it can be right The present invention modifies without departing from the spirit of inventive concepts described herein.Particularly, from different instances or embodiment Different elements can be combined.It is not intended to scope of the invention is limited to shown or described specific embodiment.

Claims (12)

1. a kind of method, including：

First image of capturing scenes；

Using the illumination bright field scape of the first amount from light source, the light source includes light emitting diode（LED）Array；

When using the illumination bright field scape of the first amount, the second image of capturing scenes,

Create the three-D profile of scene；

Based on the three-D profile, described first image and second image, the opposite light quantity of each part of scene is calculated,

Wherein, the opposite light quantity of each part for calculating scene determines that the first part of scene and the second part of scene connect Receive different amounts of light；

The light source is activated to irradiate the opposite light quantity calculated,

Wherein, the activating light source includes providing first magnitude of current to the first LED, and the first LED illuminates first of scene Point, and second magnitude of current is provided to the 2nd LED, the 2nd LED illuminates the second part of scene；And

The final image of capturing scenes.

2. according to the method described in claim 1, wherein, the light of first amount from light source is uniform and/or has Low light output.

3. method according to claim 1 or 2,

Wherein, before the three-D profile for creating scene, second image of capturing scenes；

Wherein, the three-D profile of scene is determined based on the described first image of scene and/or the second image；And

Wherein, for each part of scene, determine and compare described first image brightness value and second image it is bright Angle value, to calculate the best light quantity of the part of scene.

4. method according to claim 1 or 2,

Wherein, after the three-D profile for creating scene, second image of capturing scenes；

Wherein, the three-D profile of scene is determined based on the described first image of scene；And

Wherein, for each part of scene, determine and compare described first image brightness value and second image it is bright Angle value, to calculate the best light quantity of the part of scene.

5. according to the method described in claim 1,

Wherein, a kind of in several light illumination modes is selected；And

Wherein, the opposite light quantity of each part of scene is calculated also according to selected pattern.

6. according to the method described in claim 1, wherein：

The scene corresponds to the image of camera gun viewing；

The method further includes receiving the order for the camera lens that furthers；

The first part of scene is than the second part closer to the center of scene；And

First amount is more than second amount.

7. according to the method described in claim 1, wherein：

The scene corresponds to the image of camera gun viewing；

The method further includes receiving the order of track back；

The first part of scene is than the second part closer to the edge of scene；And

First amount is more than second amount.

8. according to the method described in claim 1, wherein, the first LED in array emits and the 2nd LED transmittings in array The white light of the different emission spectra of white light.

9. according to the method described in claim 1, wherein, the array of the LED is the first array of LED, and the light source also wraps The second array of LED is included, the first array of LED illuminates the first part of scene, and the second array of LED illuminates the of scene Two parts.

10. according to the method described in claim 1, wherein, the array of the LED is the first array of LED, and the light source also wraps The second array of LED is included, the first array of LED and the second array of LED illuminate the same section of scene.

11. according to the method described in claim 7, wherein, first array emitter of LED and the second array of LED The light of different emission spectras.

12. a kind of structure, including：

Camera, the camera have visual field；

Light source, the light source include light emitting diode（LED）Array；And

Microprocessor, the microprocessor coding have instruction, described instruction to be used for：

First image of FOV of acquisition；

Utilize the illumination bright field of the first amount from the light source；

When using the illumination bright field of the first amount, the second image of FOV of acquisition；

Create the three-D profile of visual field；

Based on the three-D profile, described first image and second image, the opposite light quantity of each part of visual field is calculated；

The light source is activated to irradiate the opposite light quantity calculated；And

The final image of FOV of acquisition,

The opposite light quantity of the wherein described each part for calculating visual field determines that the first part of visual field and the second part of visual field connect Receive different amounts of light；And

The wherein described activating light source includes：

First magnitude of current is provided to the first LED, the first LED illuminates the first part of visual field, and

Second magnitude of current is provided to the 2nd LED, the 2nd LED illuminates the second part of visual field.